Hi,
I have a dataframe, y, with 1000 rows and 266 columns. The first column
of y is a 2 level factor response; columns 2:266 are each ordinal
variables that can take on one of the values 1, 2, or 3.
I'm trying to fit a model with the calls:
(A) y.tree <- tree(pref~.,data=y,mindev=0,minsize=2)
and
(B) y.tree <- tree(pref~.,data=y,split='gini')
pref is the name of the factor response variable.
In (A) I can fit a model using only about 600 rows of y before getting the
error message below and in (B) I can only use about 100 rows of y before I
get the error message. In both (A) and (B) I'm trying to use all 265
variables.
The error message is:
Error in "row.names<-.data.frame"(*tmp*, value = fit$node[1:n]) :
duplicate row.names are not allowed
If instead of using tree() I use rpart() with the call
(C) y.part <-
rpart(pref~.,data=y,method="class",parms=list(split="gini"))
the model can be fit using all the data in y, and no error messages.
Thanks in advance.
m
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| Michael Fugate Phone: (505) 667-0398 |
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